Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/24—Macromolecular compounds
  • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C04B24/2623—Polyvinylalcohols; Polyvinylacetates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/06—Polyethene
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B14/02—Granular materials, e.g. microballoons
  • C04B14/022—Carbon
  • C04B14/024—Graphite
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B14/02—Granular materials, e.g. microballoons
  • C04B14/022—Carbon
  • C04B14/026—Carbon of particular shape, e.g. nanotubes
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/24—Macromolecular compounds
  • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C04B24/2611—Polyalkenes
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/24—Macromolecular compounds
  • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C04B24/2641—Polyacrylates; Polymethacrylates
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
  • C04B26/02—Macromolecular compounds
  • C04B26/26—Bituminous materials, e.g. tar, pitch
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
  • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
  • C04B40/0039—Premixtures of ingredients
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/02—Elements
  • C08K3/04—Carbon
  • C08K3/042—Graphene or derivatives, e.g. graphene oxides
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/10—Homopolymers or copolymers of propene
  • C08L23/12—Polypropene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
  • C08L29/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2555/00—Characteristics of bituminous mixtures
  • C08L2555/30—Environmental or health characteristics, e.g. energy consumption, recycling or safety issues
  • C08L2555/34—Recycled or waste materials, e.g. reclaimed bitumen, asphalt, roads or pathways, recycled roof coverings or shingles, recycled aggregate, recycled tires, crumb rubber, glass or cullet, fly or fuel ash, or slag
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2555/00—Characteristics of bituminous mixtures
  • C08L2555/40—Mixtures based upon bitumen or asphalt containing functional additives
  • C08L2555/80—Macromolecular constituents
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2555/00—Characteristics of bituminous mixtures
  • C08L2555/40—Mixtures based upon bitumen or asphalt containing functional additives
  • C08L2555/80—Macromolecular constituents
  • C08L2555/86—Polymers containing aliphatic hydrocarbons only, e.g. polyethylene, polypropylene or ethylene-propylene-diene copolymers

Definitions

• the present invention refers to the technical field of the production of bituminous conglomerates for road paving.
• the invention refers to an additive composition for bituminous conglomerates which allows to improve the mechanical performances of the bituminous conglomerate comprising said additive, as well as prolonging the lifetime of the road paving made with such bituminous conglomerate.
• additives for improving the performances of the bituminous conglomerates, and of the asphalts in general can be compositions comprising thermoplastic polymers for improving the mechanical properties of the bituminous asphalt containing such additives, in particular the breaking strength and resistance to cracks formation in the bituminous conglomerate, typically used as covering surface for roads.
• a composition of asphalt comprising aggregates, granular or powder material deriving from rubber scrap, for example tyres, and a mixture of thermoplastic polymers and co-polymers, as well as additional additives and filling materials, is described in the international patent application WO2015179553.
• the Chinese patent application CN 106280505 refers to an additive for asphalts in form of a mixture, comprising polyolefins in granules and other materials including a plasticiser, preferably dioctylphthalate. This additive too is effective in decreasing cracks formation in asphalts made with it.
• the Chinese patent CN102585520 refers to an additive for asphalt, comprising polypropylene, polyethylene, PVB, comprising dioctylphthalate as plasticizer as well, and moreover: a dispersing agent, a thixotropic agent and a metal-based powder. This additive improves the performances of the asphalt mixtures.
• the Chinese patent application CN 103509356 also relates to an asphalt mixture comprising polyolefins (polyethylene, styrene-butadiene-styrene, polyethylene terephthalate), polyvinylbutyral as binding agent and a filling material.
• polyolefins polyethylene, styrene-butadiene-styrene, polyethylene terephthalate
• polyvinylbutyral as binding agent and a filling material.
• the additives for improving the chemical and mechanical properties of the commercially available asphalts, as well as the asphalts which can be made with said additives are in general formulated keeping in mind the environmental impact, for example comprising scrap materials from other industrial processes or recycled materials, as it is the case for example of the asphalt composition described in application WO2015179553, such products are still not able to combine the improvement of the mechanical properties of the bituminous conglomerates with a concrete decrease of the environmental impact in producing the same, at both a qualitative and quantitative level of the raw material used.
• the problem underlying the present invention was to provide an additive composition intended to be mixed into bituminous conglomerates for road paving, wherein the composition were suitable for improving the mechanical properties of the bituminous conglomerate made by mixing said composition with other appropriate components and at the same time lacks the above mentioned drawbacks, therefore at the same time being more environmentally sustainable.
• an additive composition intended to be mixed into a bituminous conglomerate for road paving and suitable for improving the mechanical properties of said bituminous conglomerate comprising at least one thermoplastic polymer, a polymeric compound selected from the group consisting of polyvinylbutyral (PVB), polyethylacrylate (PEA) polymethylacrylate (PMA), polybutylacrilate (PBA), lignin and mixtures thereof, and graphene.
• PVB polyvinylbutyral
• PEA polyethylacrylate
• PMA polymethylacrylate
• PBA polybutylacrilate
• said at least one thermoplastic polymer is a polyolefin, preferably it is polyethylene, or polypropylene, or any other mixture of polyethylene and polypropylene.
• thermoplastic polymer is a mixture of polyethylene and polypropylene comprising a quantity of polyethylene between 25 and 75% by weight based on the total weight of the mixture.
• thermoplastic polymer is a mixture of polyethylene and polypropylene as reported in the following Table 1 , wherein the values by weight are calculated on the total weight of the mixture of polyethylene and polypropylene.
• thermoplastic polymer is recycled material.
• thermoplastic polymer used in the additive composition according to the present invention is virgin material or a mixture of the above-mentioned recycled material and virgin material.
• the additive composition according to the present invention intended to be mixed into bituminous conglomerates, can essentially consists of the above-mentioned components, without the aid of further components, such as plasticizers, sulfur compounds, salts and/ or other materials.
• the polymeric compound contained in the additive composition according to the invention is polyvinylbutyral (PVB).
• the above-mentioned polymeric compound is a recycled compound, preferably recycled PVB, more preferably obtained by means of a process of recovery of the same from the post-usage treatment of vehicle windscreen and/ or double glazing of buildings.
• the above-mentioned polymeric compound, in particular polyvinylbutyral, used in the additive composition according to the present invention is virgin material or a mixture of the above-mentioned recycled material and virgin material.
• graphene is meant a carbon material with two-dimensional structure of carbon monoatomic layers with hexagonal matrix, wherein each carbon atom is bound to other three carbon atoms by a covalent bond and bound to the atoms of the adjacent layers by Van Der Waals forces, as well as it is meant any derivative functionalized of such carbon material, for example graphene oxide, i.e. graphene partially functionalized with oxygen comprising groups.
• the graphene used in the additive composition according to the present invention preferably has an apparent density between 2 and 100 g/dm ⁇ , more preferably between 10 and 70 g/dm ⁇ ; at the same time, graphene used in the additive composition according to the present invention has a superficial area between 10 and 300 m ⁇ /g.
• Said superficial area is measured by means of a BET method by absorption of inert gas (nitrogen), in particular according to the procedure ISO 9277:2010.
• the lateral dimensions of the graphene layers are smaller than 200 ⁇ , preferably smaller than 100 ⁇ , more preferably smaller than 50 ⁇ .
• the graphene used in the additive composition according to the present invention is recycled graphene.
• the graphene used in the additive composition according to the present invention is virgin graphene or a mixture of recycled graphene and virgin graphene.
• the additive composition intended to be mixed into bituminous conglomerates for road paving according to the invention can exist as mixture of partially or totally recycled materials; the additive composition according to the invention is consequently particularly environmentally sustainable, determining not only a clear net saving of raw materials, but also a related decrease of carbon dioxide emissions (which would otherwise be emitted in the environment during the processes of synthesis of the materials at issue).
• the graphene included in the additive composition according to the invention is contained in a quantity between 0.005 and 1%, more preferably between 0.005 and 0.15%, even more preferably between 0.01 and 0.1% by weight based on the total weight of the composition.
• thermoplastic polymer comprised in the additive composition according to the invention is contained in a quantity between 45 and 95 %, more preferably between 50 and 90 % by weight based on the total weight of the composition.
• the above-mentioned polymeric compound comprised in the additive composition according to the invention preferably polyvinylbutyral, is contained in a quantity between 5 and 55 %, more preferably between 10 and 50 % by weight based on the total weight of the composition.
• a particularly preferred additive composition intended to be mixed into bituminous conglomerates consists of the following components, expressed in percentage by weight based on the total weight of the composition:
• thermoplastic material 50-95 thermoplastic material 50-95
• the additive composition according to the invention is produced in particle form, for example in granular form or in form of chips, preferably with particles having an average diameter between 0.5 and 10 mm, more preferably between 4 and 6 mm, or in form of powder, preferably with particles having an average diameter between 0.08 and 3 mm, more preferably between 0.5 and 3 mm.
• the additive composition according to the invention can be obtained by a process comprising the separate grinding of the above- mentioned thermoplastic polymer, of the polymeric compound, preferably polyvinylbutyral, and of the graphene and their subsequent mixing.
• the above-mentioned process to obtain the additive composition according to the invention results in obtaining an additive composition according to the invention in form of powder or in granular form with particles having an average diameter between 0.08 and 3 mm, preferably between 0.5 and 3 mm.
• the above-mentioned grinding step can be performed with the aid of a mill with cooled rotor or a granulator rotor or by cryogenic grinding.
• the use of the additive composition according to the present invention in any of its embodiments, is also envisaged to produce bituminous conglomerates, in order to improve their mechanical performances, as well as to prolong the lifetime of the road paving made with such bituminous conglomerates.
• bituminous conglomerate suitable for making road paving with high mechanical performances.
• bituminous conglomerate includes aggregates, including, for example, inert, inorganic materials such as crushed stone materials, granular and crushed slag, artificial aggregates produced, for example, by high temperature melting of certain minerals or rocks (e.g. bauxite or certain clays), fillers, bitumen as well as the above-mentioned additive composition, which is generally contained in a quantity between 0.09 and 15%, preferably between 2 and 6%, more preferably 5%, by weigh based on the total weight of said bitumen
• said bituminous conglomerate includes a bitumen quantity of between 3 and 7% by weight based on the total weight of the bituminous conglomerate, more preferably a bitumen quantity of between 4 and 6,5 % by weight based on the total weight of the bituminous conglomerate.
• bitumen is generally meant a material comprising a solid dispersing phase at room temperature, having a thermoplastic behavior, said dispersing phase includes high molecular weight organic compounds, mainly hydrocarbons with a number of carbon atoms higher than 25.
• said dispersing phase can generally be dispersed traces of sulfur, nitrogen, oxygen and metal such as nickel, iron and vanadium.
• the present invention relates to a method for producing a bituminous conglomerate suitable for making a road paving with high mechanical performances, comprising the step of adding to said aggregates, under stirring and at a varying temperature between 130°C and 200°C, preferably between 165°C and 185°C, more preferably between 170°C and 180°C, an additive composition as described above according to the invention, as well as comprising bitumen and a filler.
• the additive composition according to the present invention when added to bituminous conglomerates for road paving, allows to obtain a road pavement with high mechanical performances, such as high tensile strength, high stiffness and high fatigue resistance, as it is explained in more detail with reference to the detailed description.
• a road surface made with a bituminous conglomerate comprising the additive composition according to the present invention has also a scarce tendency in relation to the rutting phenomenon, with respect to a road surface made with a bituminous conglomerate not comprising the additive composition according to the invention, as it will be explained in more detail with reference to the detailed description.
• the layers of the latter can have a smaller thickness, given the same service life, when compared to a road paving made with a bituminous conglomerate not comprising the additive composition according to the invention.
• a conglomerate comprising such additive composition entails not only the need of a smaller quantity of aggregates and bitumen, determining a decrease of carbon dioxide emissions which would otherwise occur in the production/ extraction and in the transportation of the above- mentioned raw materials, but also a substantial energy saving (and related smaller environmental impact) due to the smaller production of bituminous conglomerate which, as previously illustrated, needs handlings at quite high temperatures.
• composition according to the present invention is easy and safe to handle, because it is free from fine powders, which might be inhaled by the operators who use it.
• composition according to the present invention can moreover be stored for prolonged periods of time, even for many months, without risks of packing, and maintains its flowability properties unaltered over time, which properties are important when adding this composition to the bituminous conglomerate, in order to ensure its accurate and reproducible dosing.
• the characteristics and the advantages of the present invention will be further highlighted by some embodiments thereof, which are hereinafter exposed by way of illustration and not of limitation.
• additive compositions according to the present invention which have been prepared and tested with favorable results in relation to their effect of increasing the mechanical performances in the production of bituminous conglomerate.
• a comparative example follows, wherein a possible additive composition is shown, not comprising graphene and not according to the present invention.
• Example 3 Mixture of polyethylene and polypropylene (60:40) 49.95% polyvinylbutyral 49.95% recycled graphene 0.1%
• Example 8 Mixture of polyethylene and polypropylene (70:30) 89.995% polyvinylbutyral 9.995% virgin graphene 0.01%
• compositions of Examples 1- 1 1 were prepared by grinding separately the mixture of polyethylene and polypropylene, the polyvinylbutyral and the graphene, and by mixing then the grinded components inside a mixer, obtaining a homogeneous mixture with particles having an average diameter of 2 mm.
• Example 12 The composition of Example 12 was prepared in the same way, starting only from mixture of polyethylene and polypropylene and from polyvinylbutyral.
• Example 13 The composition of Example 12 was prepared in the same way, starting only from mixture of polyethylene and polypropylene and from polyvinylbutyral.
• bituminous conglomerate is prepared in the laboratory by means of the procedure that follows, using devices which simulate, in function, machinery on higher scale, usually used in plants for the production of bituminous conglomerate:
• the blend is maintained at a temperature between 170 and 180°C during all the steps of processing thereof.
• bituminous conglomerate B instead of the composition of Example 8 according to the invention, the composition of Example 12 not according to the invention (which is graphene-free) is added.
• bituminous conglomerate C after the step of heating the aggregates, a step of adding bitumen to them directly follows.
• the blend of bituminous conglomerate obtained thereby is then discharged from the mixer, dosed in a quantity equal to about 1210 g in containers and subsequently it is conditioned in oven at a temperature of 150°C for about 3 hours (to simulate the transportation conditions).
• bituminous conglomerate obtained thereby, after the step of oven conditioning, is then inserted inside a template. Then, in order to obtain a voids percentage of about 2.5%, a compaction by means of gyratory compactor is performed (alternatively to the gyratory compactor it is possible to use any other type of compactor suitable for the purpose, for example a Marshall compactor):
• Each briquette was respectively housed in a mechanical press of the designated test basket, then a tensile strength test was performed according to the methodology UNI EN 12697-23.
• the mechanical characterization occurred with the Indirect Tensile Strength (ITS).
• ITS Indirect Tensile Strength
• the ITS simulates the maximum stress generated by vehicle passage which can be tolerated by the road pavement.
• the additive composition according to the present invention allows to increase the Indirect Tensile Strength by about 60% in a bituminous conglomerate made with it (conglomerate A) if compared with a traditional bituminous conglomerate with bitumen as such (conglomerate C), and by 9% if compared to a bituminous conglomerate comprising an additive composition substantially identical regarding polyethylene/ propylene and PVB contents but which is graphene-free (conglomerate B).
• An increase of the Indirect Tensile Strength implies therefore a higher strength of the bituminous conglomerate subjected to load and, therefore, the additive composition according to the present invention allows to formulate a bituminous conglomerate which allows to build a road paving characterized by a longer service life.
• the considerable increase of direct tensile strength obtained with the composition according to the present invention if compared to a composition which is identical except for lacking a graphene quantity of only 0.01% by weight, has to be considered totally surprising.
• Each briquette was respectively placed on a designated housing of a servo- pneumatic system for dynamic tests, which was in turn contained in a climatic cell for temperature control; subsequently, a test for the determination of the stiffness modulus was performed according to the methodology UNI EN 12697-26.
• Peak time 124 ms (frequency 2 Hz);
• the additive composition according to the invention when used for the formulation of a bituminous conglomerate, determines in the latter a substantial increase of the stiffness modulus with respect to both the traditional conglomerate (conglomerate C) and the conglomerate comprising the additive composition according to Example 12, which is graphene-free (conglomerate B).
• the conglomerate A comprising the additive composition according to the invention (Example 8)
• Three panels of conglomerate A, three panels of conglomerate B and three panels of conglomerate C were used to perform the test of monitoring the rutting, meant as a phenomenon of longitudinal deformation caused by a thickening under the loading axle with consequent lateral movement of the bituminous mixture during wheel passage.
• Each panel was respectively placed on a designated housing in a rutting machine ( wheel tracking machine), which was in turn contained in a climatic cell for temperature control; subsequently, a test for the determination of the fatigue resistance was performed according to the methodology UNI EN 12697-22.
• WTS Wiel Tracking Slope
• the test condition imposed for the determination of the resistance to rutting was a temperature of 60°C.
• Rut depth Rut depth PRD air WTS air at 5,000 at 10,000 10,000 (%) (mm/ 1000 cycles (mm) cycles (mm) cycles)
• the graphene contained in the additive composition according to the present invention although said graphene is present in a definitely small quantity (0.01% by weight in the composition according to Example 8), determines a considerable and surprising increase of resistance to rutting.

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• 2018
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• 2020
  • 2020-05-05 CO CONC2020/0005619A patent/CO2020005619A2/es unknown
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